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Thursday debate BS7671 vs CoMCoP & Gas Safe

Sergio Fernandez

I was on FaceBook the other day a saw a meter box which had the gas meter removed.  They had connected an Earth/Bond cable to the 2 ends of the remaining now defunct gas pipes.  It seems this is standard practice when a Gas meter is removed.

Several questions and points to discuss
If there is NO earth clamp on the customer side of gas meter within the permitted length of 600 mm of the outlet union of the meter; and before any branch (tee) in the pipework should the Earth bond be installed by the Gas meter engineer?  The practice of just putting the bond across where the gas meter used to be without proper consideration means that a healthy Ze and Zs could be compromised.  Additionally they could accidentally introduce potential into the building.  Do the Gas meter engineers test to see if this is an Extraneous conductive part?

Scenario 2
There is an Earth Bond of customer side of meter do the Gas meter engineers check with a clamp meter to see if there is mA or Amps.  mA probably being acceptable but Amps not acceptable.  Consider a PEN fault




As always please be polite and respectful in this purely academic debate.




Come on everybody let’s help inspire the future.

Parents

  • Reg 10 of  The Gas Safety (Installation and Use) Regulations 1998 (legislation.gov.uk) says;

    "10.  In any case where it is necessary to prevent danger, no person shall carry out work in relation to a gas fitting without using a suitable bond to maintain electrical continuity until the work is completed and permanent electrical continuity has been restored."

    Meter operators carry voltage sticks as part of their kit, i presume they found some voltage on the installation and decided to bond the two pipes permanently.

    I use a car jump lead between the ends of pipework as a temporary bond when removing meters or lengths of pipe. I am Gas Safe Registered but don't fit meters

  • in reply to OlympusMons

    I wonder if they use and carry contact and non-contact voltage sticks?  Do they use clamp meter on the Earth bond to measure for mA and Amps?

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